Sarah left home at 9.30 a.m. and drove towards the city which was 779 km away. For the first 414 km, she was travelling at 69 km/h. Then she increased her speed by 4 km/h and completed the remaining journey.
- How long did she take for her whole journey?
- At what time did she reach the city?
(a)
Time taken to travel 414 km
= 414 ÷ 69
= 6 h
Distance of the remaining journey
= 779 - 414
= 365 km
Speed for remaining journey
= 69 + 4
= 73 km/h
Time taken to travel remaining journey
= 365 ÷ 73
= 5 h
Time taken to travel the whole journey
= 5 + 6
= 11 h
(b)
11 h after 9.30 a.m. = 8.30 p.m.
Answer(s): (a) 11 h; (b) 8.30 p.m.